Question

What structures are helpful for the exchange of gases? ​

Answer 1

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However, in most larger organisms, which have a small surface-area to volume ratios, specialised structures with convoluted surfaces such as gills, pulmonary alveoli and spongy mesophyll provide the large area needed for effective gas exchange.

Answer 2

Answer:

special structures with convoluted surfaces such as gills. and pulmonary alveoli and spongy mesophyll provide the large area is needed for effective gas exchange

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